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Commit 4734ae78 authored by Shashi Shekar Shankar's avatar Shashi Shekar Shankar Committed by Linux Build Service Account
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Performance: Enable Aggressive trim settings 

This change will enable aggressive trim settings for targets
up to 1GB. The change can be turned on/off from system properties.
By default, the properties are set for targets up to 1GB.

CRs-Fixed: 783020

Change-Id: I233dddbff07e7ec1fe2ee96402fe1d411903beb5
parent e3c2f235

services/core/java/com/android/server/am/ProcessList.java

+32 −3
Original line number Diff line number Diff line
@@ -32,6 +32,7 @@ import com.android.server.wm.WindowManagerService; 
import android.content.res.Resources;

import android.graphics.Point;

import android.os.SystemProperties;

import android.os.Process;

import android.net.LocalSocketAddress;

import android.net.LocalSocket;

import android.util.Slog;
@@ -134,6 +135,16 @@ final class ProcessList { 
    // processes and the number of those processes does not count against the cached

    // process limit.

    static final int MAX_CACHED_APPS = SystemProperties.getInt("ro.sys.fw.bg_apps_limit",32);

    static final boolean USE_TRIM_SETTINGS =

            SystemProperties.getBoolean("ro.sys.fw.use_trim_settings",true);

    static final int EMPTY_APP_PERCENT = SystemProperties.getInt("ro.sys.fw.empty_app_percent",50);

    static final int TRIM_EMPTY_PERCENT =

            SystemProperties.getInt("ro.sys.fw.trim_empty_percent",100);

    static final int TRIM_CACHE_PERCENT =

            SystemProperties.getInt("ro.sys.fw.trim_cache_percent",100);

    static final long TRIM_ENABLE_MEMORY =

            SystemProperties.getLong("ro.sys.fw.trim_enable_memory",1073741824);

    public static boolean allowTrim() { return Process.getTotalMemory() < TRIM_ENABLE_MEMORY ; }



    // We allow empty processes to stick around for at most 30 minutes.

    static final long MAX_EMPTY_TIME = 30*60*1000;
@@ -143,11 +154,25 @@ final class ProcessList { 


    // The number of empty apps at which we don't consider it necessary to do

    // memory trimming.

    static final int TRIM_EMPTY_APPS = MAX_EMPTY_APPS/2;

    public static int computeTrimEmptyApps() {

        if (USE_TRIM_SETTINGS && allowTrim()) {

            return MAX_EMPTY_APPS*TRIM_EMPTY_PERCENT/100;

        } else {

            return MAX_EMPTY_APPS/2;

        }

    }

    static final int TRIM_EMPTY_APPS = computeTrimEmptyApps();



    // The number of cached at which we don't consider it necessary to do

    // memory trimming.

    static final int TRIM_CACHED_APPS = (MAX_CACHED_APPS-MAX_EMPTY_APPS)/3;

    public static int computeTrimCachedApps() {

        if (USE_TRIM_SETTINGS && allowTrim()) {

            return MAX_CACHED_APPS*TRIM_CACHE_PERCENT/100;

        } else {

            return (MAX_CACHED_APPS-MAX_EMPTY_APPS)/3;

        }

    }

    static final int TRIM_CACHED_APPS = computeTrimCachedApps();



    // Threshold of number of cached+empty where we consider memory critical.

    static final int TRIM_CRITICAL_THRESHOLD = 3;
@@ -308,8 +333,12 @@ final class ProcessList { 
    }



    public static int computeEmptyProcessLimit(int totalProcessLimit) {

        if(USE_TRIM_SETTINGS && allowTrim()) {

            return totalProcessLimit*EMPTY_APP_PERCENT/100;

        } else {

            return totalProcessLimit/2;

        }

    }



    private static String buildOomTag(String prefix, String space, int val, int base) {

        if (val == base) {